If you create a share with permissions for everyone on the destination server, then map as a local drive letter on Physical server you are trying to P2V, it will work. There is some kind of permissions issue with using older versions of Windows to try to remotely manage Hyper-V or VMWare on newer OS...

Ran into this myself, used an old Hirens Boot CD based on XP to boot the VM then ran the FixHDC script, this generalizes the boot drivers for storage, allowing the different hard drive controller to be used. Otherwise the mass storage driver used at boot time cannot "see" the boot drive/wi...